One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,6)(3,7,8,5)(10,13)(11,14)(15,16)(17,18)(19,27)(20,23)(21,26)(22,25)(24,29)(28,32)(30,31)(1,3,4,8)(2,5,6,7)(9,10,12,13)(11,14,15,16)(18,23)(24,31)(25,26)(27,32)(9,11)(10,14)(12,15)(13,16)(17,19,20,28)(18,24,23,31)(21,30,22,29)(25,32,26,27)(9,10,12,13)(11,14,15,16)(18,25)(21,22)(23,26)(24,32)(27,31)(29,30)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.